Calender-protector



(No Model.)

W. P. MQOARTHY.

GALENDER PROTECTOR; No. 362,294. Patented May 3, 1887.

UNITED STATES PATENT OFFICE.

WILLIAM F. MCCARTHY, OF HOLYOKE, MASSACHUSETTS.

CALENDER-PROTECTQR.

SPECIFICATION forming part of Letters Patent No. 362,294; dated May a, 1887.

Application filed December 2, 1886. Serial No. 220,451. (N0 model.)

To all whom it may concern.-

Be itknown that 1, WILLIAM F. hICGARTHY,

dering machines, to prevent the accidental feeding to the machine of more than a single sheet of paper at a time, and also to prevent the entrance between the rolls of a sheet of paper of greater thickness than that for which the machine is set. Heretofore such guard or protecting device has consisted of a bar secured to the frame of the machine and extending the full lengththereof above the feed-ro1l, said bar having rigid arms adjustably connected therewith and extending downwardly toward the feed-roll, the distance between the ends of said arms and the periphery of the roll being slightly greater than the thickness of the paper to be calendered. \Vhen aehange is to be made to thicker or thinner paper, each arm is adjusted to a higher or lower position to correspond therewith. This device, besides necessitating the loss of much time in the independent adjustment of each arm, is open to the further objections that the arms being rigid are liable to be broken off when a thick sheet of paper or card-board is carried against them by the feed-roll, and that, since the arms necessarily extend downwardly between the bands which guide the paper to and around the rolls, they interfere with the lateral adjustment of said bands to suit different widths of paper.

The object of my invention is to produce at protecting device which will obviate the objections above noted, and at the same time constitute a more efficient guard to prevent the entrance to the rolls of sheets of improper thickness.

To this end my invention consists in a protector composed of a bar, preferably in the form of a roll, adj ustably supported above the feed-roll in such manner as to lie wholly within the line of travel of the guiding-bands.

My invention consists, further, in a pro tector composed of a roll adjustably mounted upon thejournal-boxes of the feed-roll above the latter, said roll being provided with a series of detents for arresting the progress of g sheets of improper thickness between said roll and the feed-roll, in the manner hereinafter described.

My invention, furthermore, comprises certain details of construction connected with the mounting of said roll, hereinafter fully described, and particularly pointed out in the claims. V

Referring to the drawings, in which like letters designate like parts in the several views, Figure 1 is a view in perspective of so much of a rsheet-calendering machine with my invention applied thereto as is necessary to show the operation thereof. Fig. 2 is a perspective View showing in detail the parts which constitute one of the brackets for supporting the detent-roll- Fig. 3 is a similar view showing said parts assembled to form the bracket. Figs. 4, 5, and 6 are sectional views illustrating the operation of my invention, as hereinafter described.

The letters A and B designate, respectively, V

the feed-roll and the first papenroll of a sheetcalendering machine, the remaining rolls be ing omitted from the drawings. derstood, however, by those skilled in the art that usually five of these rolls, arranged in a substantially-vertical plane, are employed, the steel rolls alternating with the paper-rolls, and that the rolls being properly adjusted relatively to each other to receive paper of a certain thickness, the paper is fed to the feedroll one sheet at a time, and is so guided by bands that it passes between each two rolls and issues from the last with a calendered surface.

The letter C designates one of the journalboxes in which the feed-roll is supported at each end, the journal-boxes of each roll being grooved at the ends to receive and have vertical movement upon the uprights D of the frame of the machine, said uprights being connected at each end by the cross-beams E, as shown. By thus supporting saidjournal-boxes provision is made for a vertical yielding of the rolls to admit paper of various degrees of thickness, the amount of such yielding movement,

It will be unhowever, being regulated and controlled by the screws F, mounted in the cross-beams E.

The: letters G and H designate the bandrolls, around which pass the bands or tapes K, which guide the paper in its passage through the rolls. These bands are increased or decreased in number and placed at various distances apart, to correspond with the width of the paper to be calendered.

L, in Figs. 1 and 4, designates asheet of paper at the instant of being grasped between the bands and the feed-roll as it is fed to the machine.

The construction as thus far described constitutes the ordinary sheetcalender-ing machine, and when proper care is taken by the operator to feed no more than a single sheet at a time, and when the paper is of uniform thickness throughout, nothing further is required to enable such machine to successfully accomplish its function; but when, as is always liable to occur, the operator feeds in two sheets instead of one, or when, owing to defects in its manufacture or to the accidental mixing of different grades, the paper is made up of sheets of different degrees of thickness, more or less serious damage is sure to result to the machine, for the rolls, being set to receive. a single sheet of a specified thickness, cannot yield sufficiently to receive two. sheets, or even a single sheet of greater thickness, and consequently when the thicker substance is drawn between them they are either forced from their bearings or are fracturedfat some point between their bearings, in either case wrecking the machine. before stated, to the use of a protector or guard to intercept such double or thicker sheets andprevent their entrance between the rolls.

fied, I have devised the means which I will now proceed to describe.

The letter M designates a bar, preferably made in the form of a roll, as shown, having projecting therefrom at intervals the detents N, which may be pointed or provided with angular corners, for a purpose presently described. The roll. M is adjustably supported at each end by a bracket, P, said brackets having downwardly-projecting flanges f, whereby they are adapted to be secured to the upper sides of the journal-boxes O of the feed-roll, as shown in Fig. 1, by means of the set-screws 71, passing through holes 9 therein, and the setnuts 7t. (SeeFigs. 2 and 3.) The letter O designates an adjusting bar having slot 0 therein and having at one end ajournal-bearing, a b, for the end of roll M. One of these bars 0 is secured to each of the brackets P by a bolt, m, passing through ahole, e, in an upturned arm, (I, on the bracket and through slot 0 in the bar, and by a nut, Z, turned upon the bolt, which looks said parts together.

a When the roll M is mounted in the bearings a b, it is obvious that by loosening the nuts Z the said roll can be adjusted both vertically This danger has led, as hereinand horizontally, and that, being supported at the ends only, it lies wholly within the line of travel of the bands K, which bands can therefore be adjusted laterally or removed from and replaced on the machine without re gard to said roll. The roll is supported 1n the bearings a b so as to revolve freely, and the normal position of the detents N thereon should be substantially that shown in Figs. 4-

and 5.

The operation is as follows: Supposing the thickness of the paper to be calendered to be one-sixteenth of an inch, the screws F will be set to allow the feed and other rolls a yielding capacity to correspond therewith, and the roll M will be so adjusted with reference to the feed-roll, by means of the bars 0, bolts m, and nuts Z, that paper of that thickness will pass freely beneath said roll without touching it, as shown in Fig. 4, the feed-roll revolving in the direction indicated by the arrow in said figure. So long as this limit in thickness is not exceeded the roll M remains idle; but should the operator inadvertently present two 'or more sheets to the machine at once, as in- 'dicated at L in Fig. 5, said sheets will contact with said roll and be arrested in their progress, as shown in said figure, whereupon the operator is advised of and can rectify his error, either by stopping the machine and removing the sheets, or, when the paper is of sufficiently strong texture, by quickly withdrawing them from between the guiding-bands and the periphery of the feed-roll.

It the carelessness of the operator were the only contingency to be provided against, the roll M would accomplish its function, as just described, without the detents N, and need not be cylindrical in form; but it' often happens that, through defective manufacture, or in the accidental eommingling of different grades of paper, occasional sheets will be of greater thickness than the others, but still less than the combined thickness of two sheets, so that instead of contacting with the body of the roll, as in the former case, such a sheet would be carried beneath the roll, rotating it about its axis, and pass on around the feed-roll. It is to provide for this further contingency, therefore, that I have placed the detents N upon the roll, the result being that when the roll is thus rotated by the friction of the passing sheet the detents will be brought into contact with the sheet and clamp it so tightly against the feedroll that it can proceed. no farther, such operation being indicated in Fig. 6. When the sheet is removed, the roll can be manually returned to the position shown in Figs. 4and 5, or a light spring or other similar means may be employed for that purpose.

It will be observed that by mounting the brackets 1? upon the journal-boxes of the feedroll the roll M is always in exact horizontal alignment wit-h said feed-roll, or, in other words, is always parallel therewith, even if one end of the feed-roll should be permitted by its screw F to yield vertically more than IIO 0, I am enabled to locate the roll M directly over the center of the feed-roll, as shown, or to move it to the front or rear of that point, as may be desired; but I regard the position shown as the onein which the best results can be secured.

The number and particular character of the detents N may be varied at will, and, so far as the broader features of my invention are concerned, means for supporting the roll M other than the brackets P could be utilized without departing from the spirit thereof.

I clain1-- 1. A protector for sheet calendering machines, consisting of a bar adjustably mounted above the feed-roll and parallel therewith and lying wholly within the line of travel of the guiding-bands, substantially as set forth.

2. A protector for sheetcalendering machines, consisting of a roll adjustably mounted above the feed-roll and parallel therewith and lying Within the line of travel of the guidingbands, said roll being provided with a series of detents, substantially as and for the purpose set forth.

3. The combination, with the feed-roll of a papenoalendering machine, of a protector consisting of a roll adjnstably mounted upon the journal-boxes of said feed-roll, whereby the alignment of said rolls is assured, substantially 3 5 as described.

4. The combination, with the feed-roll of a sheet paper calendering machine, of a protector consisting of a roll having a series of detents projecting therefrom and supported at 40 each end, so as to revolve freely, by brackets secured to the upper side of the journal-bones of said feed roll, said brackets comprising means whereby the protector can be adjusted both vertically and horizontally, substantially in the manner set forth.

5. In a sheet-calendering machine, the combination, with the feed-roll mounted in j ournalboxes at each end, of brackets having downwardly-extending flanges, whereby they are adapted to be secured to the upper side of sa d journal-boxes, adj usting-bars secured to said brackets by a bolt and lockingnut, and a protector-roll supportedinjournal-bearings at the ends of said bars, substantially as and for the purpose set forth.

6. In a sheet calendering machine, the bracket 1?, having the flanges f and the lateral and vertical extension d, the bar 0, having therein the slot 0, and having the journal-bear- 6) ing a b at the end, the bolt m, and the nut Z, combined and operating substantially as set forth.

\VILLIAM F. MCCARTHY.

lVitnesses:

W. H. CHAPMAN, T. M. BROWN. 

